From Our Correspondent Calcutta, April 23 The Naxalites of West Bengal have decided to oppose the independence movement in East Bengal led by Shaikh Mujibur Rahman's followers. Naxalite posters denouncing the "so-called upheaval" as an "imperialist conspiracy against China" are appearing on walls in several parts of Calcutta. It is reliably learnt that Maoist extremists in East Bengal led by Mr. Mohammad Tuba have broken away from the united resistance movement against the military administration of West Pakistan. They maintain that the main contradiction "is not between East Bengal and West Pakistan but between feudalism and the oppressed classes in East Bengal itself". Other leftist groups in East Bengal also say that the struggle against West Pakistan domination must be followed by a class struggle within East Bengal. But they say that the second struggle can begin only after the first has been won. They have therefore actively joined the liberation movement, even though they have little faith in the Awami League leadership. Maulana Bhashani, leader of the National Awami Party (N.A.P.), which is East Bengal's largest and best organized leftist party, has pledged full support to the movement launched by the Awami League. According to a N.A.P. spokesman Maulana Bhashani has sent telegrams to President Nixon and Chairman Mao Tse-tung urging them to recognize Bangla Desh and force West Pakistan to stop the bloodshed in East Bengal. --- Calcutta, April 23.--Mr. Bruce Douglas-Mann. Labour M.P. for Kensington North, said here today that the British Government should take the initiative in imposing economic sanctions against Pakistan. Mr. Douglas-Mann is here with another Labour M.P. Mr. John Stonehouse, to investigate international relief for refugees. He said that "My Lai"—the South Vietnamese hamlet where American soldiers are said to have murdered civilians three years ago —was happening every day in East Pakistan. —Reuter. --- Our Delhi Correspondent writes: India may appeal to other nations for assistance in providing relief for, and rehabilitating, the refugees from East Pakistan, who so far number nearly 250.000. The relief centre here is spending about 75p a day for each refugee. A government spokesman said today that the centre was prepared to bear the "entire burden" and would spend "whatever money was required" to help the refugees but other nations should extend a helping hand.. --- Delhi, April 23.—Pakistan radio said tonight that Pakistan has decided to close down its Deputy High Commission in Calcutta on Monday and has asked India to shut down its Deputy High Commission in Dacca simultaneously. Earlier today Pakistan protested against the alleged failure of the Indian Government to remove the East Pakistanis who took over the Deputy thigh Commission building five days ago and declared their allegiance to the "Republic of Bangla Desh".—Reuter.